Unformatted text preview: the correct age. In 1991 a team of other scientists found evidence of just such a crater buried off the coast of the villiage of Chicxulub in Yucatan, Mexico. Consequences of the impact were profound. The immense amounts of material ejected from the crater into the atmosphere blocked or reduced sunlight levels, effectively shutting down the process of photosynthesis that is the basis of all food webs. The vaporization of rocks at impact contributed sulfur and nitric acids, which had a severe acid rain effect of vegetation and marine environments. Shocked quartz grains, usually considered diagnostic of an impact site (or a nuclear test site), have been found associated with these deposits....
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- Fall '10
- Biology, Extinction event, Cretaceous–Tertiary extinction event, Luis Alvarez, Cretaceous mass extinction